Ask your boss for a short-term leave due to family issues. Take it without pay if need be. You need to be around family and friends ASAP. At the very least you need to call someone like a close family member or friend.
Did you ditch your friends for this girl? Good friends that were good guys? Call them anyway. Call the person that you think will give you the most support. Even if it is a friend you ditched. Beg their forgiveness and tell them you really need someone to talk to.
Your first priority is to stop your perceived spiral. Get your feet firmly on the ground with another human being. Do you have such a person? Family? If not then talk to me.
You have lots of options. Your first post scared the crap out of me. You will get through this.
Then you can start thinking of your next step. Being in a location with a good support system is your short-term priority, not the fear of a salary decrease. You can always improve salary once everything else gets back in order.
I don't think that's a good reason to discard professional help. You have been hit hard, and that can happen to anybody. What's wrong with seeking help from qualified people?
I would recommend to try some new activities, like sport, to help your mind focus on something positive and meet new people, but again, that's just my advice which is by no mean qualified.
Good luck, you will meet another woman for sure bro!